Add a Adafruit Feather template
This commit adds a template for creating Adafruit Feather boards.
The specification can be found here: https://learn.adafruit.com/adafruit-feather/feather-specification
This commit adds a template for creating Adafruit Feather boards.
The specification can be found here: https://learn.adafruit.com/adafruit-feather/feather-specification